14" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w28h28 + Product Details Size -

+ Product Details Size - 22"w X 20"h is the size for the duct opening measurement only

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actual front end outer dimensions are 15

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14" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w28h28 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 24" OR 24" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 23. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum